The Kitáb-i-Aqdas
128.the Sadratu’l-Muntahá   ¶100
Literally “the furthermost Lote-Tree,” translated by Shoghi Effendi as “the Tree beyond which there is no passing.” This is used as a symbol in Islám, for example in the accounts of Muḥammad’s Night Journey, to mark the point in the heavens beyond which neither men nor angels can pass in their approach to God, and thus to delimit the bounds of divine knowledge as revealed to mankind. Hence it is often used in the Bahá’í Writings to designate the Manifestation of God Himself. (See also note 164.)